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millfork/include/zp_reg.mfk

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#if not(ARCH_6502)
#warn zp_reg module should be used only on 6502-compatible targets
#endif
inline asm byte __mul_u8u8u8() {
? LDA #0
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? JMP __mul_u8u8u8_start
__mul_u8u8u8_add:
? CLC
? ADC __reg.lo
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__mul_u8u8u8_loop:
? ASL __reg.lo
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__mul_u8u8u8_start:
? LSR __reg.hi
? BCS __mul_u8u8u8_add
? BNE __mul_u8u8u8_loop
? RTS
}